Thanks sathi for your response, but I have you ask you this question.  Is that your guess or a rule? If so, after how many days the applicaion is considered abondoned.

I had checked the status of I 485 online and  it says "Documents posted for on the address we have on file" which I never received. I called them up and ask to resend it. I guess that must be the second notice for FP.

My Application was filed in CA now I've moved to TN, If I visit the USCIS of TN is that going to be of any help? By the way I've already changed my current address on I485 application to TN.